package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
    private final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    @Override
    public User login(UserLoginDTO dto) {
        //1.构造请求参数，调用HttpClient发送请求到微信平台(目的获取微信唯一标识openid) 请求地址：GET https://api.weixin.qq.com/sns/jscode2session
        Map<String, String> paramMap = new HashMap<>();
        paramMap.put("appid", weChatProperties.getAppid());
        paramMap.put("secret", weChatProperties.getSecret());
        paramMap.put("js_code", dto.getCode());
        paramMap.put("grant_type", "authorization_code");
        String res = HttpClientUtil.doGet(WX_LOGIN_URL, paramMap);
        JSONObject jsonObject = JSON.parseObject(res);
        String openid = (String) jsonObject.get("openid");

        //2.判断openid是否存在，不存在代表登录失败，直接抛登录异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.USER_NOT_LOGIN);
        }

        //3.根据openid查找user表，如果查不到，需要注册该用户到表中
        User user = userMapper.getByOpenid(openid);
        if (user == null) {
            //代表是新用户
            user = new User();
            user.setOpenid(openid);
            user.setName(openid.substring(5,10));
            user.setCreateTime(LocalDateTime.now());
            userMapper.insert(user);
        }

        //4.否则直接返回user
        return user;
    }
}
